Concrete-mill



(No Model.)

P. WHITE & F. s. BALDWIN.

CONCRETE MILL.

No. 245,758. Patented. Aug. 16,1881.

Inven to 1 s UNITED STATES PATENT OFFICEQ PORTER WHITE AND FRANK S. BALDWIN, OF ST. LOUIS, MISSOURI.

CONCRETE-MILL.

SPECIFICATION forming part of Letters Patent No. 245,758, dated August 16, 1881.

Application filed April 18, 1881. (No model.)

1' 0 all whom 'Lt "may concern:

Be it known that we, PORTER WHITE and FRANK S. BALDWIN,of St. Louis, Missouri, have jointly made a new and usefulImprovement in Concrete-Mills, of which thefollowing is a full, clear, and exact description, reference being bad to the annexed drawings, making part of this specification, in which Figure 1 is a view, in perspective, of the improved mill, portions of the frame being broken away to exhibit the interior construction; Fig. 2, a horizontal section taken between the upper and middle beds; and Fig. 3, a horizontal section taken above the upper bed.

The same letters denote the same parts.

The present improvement consists in a vertical series of mortar-mixing beds and revolving rakes, the ingredients of the mortar or concrete being fed from a hopper into the uppermost bed and there mixed in a drystate, thence passed into the middle bed, where water is added and the mixing continued, and thence into the lowestbed, where the moistened compound is further stirred and worked, as seen in the annexed drawings, where- A represents a mill embodying the improvement, having a hopper, B, and a vertical series, G D E, of mortar-beds, supported in a suitable frame, a. In each of the beds a rake, c d e, is arranged to revolve, the rakes being attached to a shaft, F, that is stepped atf, and extending thence upward through the beds.-

Rotary motion is imparted to the shaft and rakes in any practicable manner, as by means of the shaft G and gearing H I.

The ingredients of the mortar, cement, plaster, concrete, or whatever analogouscompound the mill. is suitable for making, fall from the hopper B into the central part of the bed (3. The teeth 0 of the rake in that bed are set to work theingredients, as they are mixed, to the outer portion of the bed, where, through one or more openings, 0 0 they drop into the middle bed, D. In this last-named bed water, by means of pipes, such as shown at K 70 k, is added to the compound, and the rake-teeth d are set to work the compound to an opening, 61 at the center of the bed, through which opening the compound drops into the lowest bed, E. The teeth 6 of the rake e are set similarly to those in the bed O, causing the mortar to move, as it-is being finally mixed, to the side of the bed, where, through an outlet, 0 it is discharged from the mill. I

The present improvemen tis especially adapt ed to the mixing of gravel and cement.

We do not broadly claim the use of a series of beds and rakes, as such have been heretofore employed; nor would such generally answer our purpose, it being essential to mix the ingredients first in a dry state and afterward in a wet state, and in a separate bed.

I claim- 1. The mortar-mill A, combining in its construction the hopper B, the vertical series 0 D E of beds, the revolving rakes c d e, and the pipes K k k, the latter arranged to deliver the water into the bed D, substantially as described.

2. The combination of the vertical series 0 D E of beds, the rakes c d e, and the pipes K 70 70, arranged to discharge the water into the intermediate bed D, substantially as described.

3. A mortar-mi1l having a bed wherein the ingredients are mixed in a dry state, and thence passed to a second bed wherein the ingredients are wet and mixed.

PORTER WHITE. FRANK S. BALDWIN. Witnesses:

CHAS. D. MoonY, SAML. S. BOYD. 

